Python随机动漫选择器出现KeyError:4错误，求排查修正

问题重现 #

开发随机动漫选择器时，定义了按分类存储动漫的字典Myanimes，执行print(choice(Myanimes))时抛出KeyError:4错误。代码如下：

from random import choice
#create a list of animes and insert their genres

Myanimes= {

   "Action":["One Punch Man","Demon Slayer","Vinland Saga","Baki","Baki Hanma","Full Metal alchemist:brotherhood","Yasuke","Dragon Ball Z","Dragon Ball Super"],
   
   "Adventure":["My hero academia "," Black Clover","Naruto","Cowboy Bebop"],
   
   "Supernatural":["Blue exorcist","Jojo's Bizarre Adventure"],
   
   "Sci-fi":["Attack on Titan","Assasination Classroom","Parasyte"],
   
   "Fantasy":["Jujustsu Kaisen","Hunter x Hunter","Devilman Crybaby"],
   
   "Comedy":["Komi Can't Communicate"],
   
   "Drama":["Food Wars","The Disastrous Life of Saiki K"],
   
   "Psychological":["Code Geass","Mob Pyscho","Death Note"],
   
   "Horror":["Castlevania","Record of Ragnarok"],
}
print(choice(Myanimes))

报错信息：

KeyError: 4

错误原因 #

• random.choice()的参数必须是序列类型（如列表、元组，支持通过整数索引访问元素）
• 直接传入字典时，函数会生成随机整数索引（如4），并尝试用Myanimes[4]取值，但字典的键均为字符串类型，不存在整数键4，因此触发KeyError

解决方案 #

根据需求选择对应实现：

1. 随机选择一个动漫分类 #

将字典的键转换为列表后传入choice()：

print(choice(list(Myanimes)))

2. 随机选择一部动漫 #

先随机选中一个分类，再从该分类的动漫列表中随机选作品：

# 随机选分类
random_genre = choice(list(Myanimes))
# 从分类中随机选动漫
random_anime = choice(Myanimes[random_genre])
print(f"随机推荐：{random_anime}（分类：{random_genre}）")

修正后的完整代码示例 #

from random import choice

Myanimes= {
   "Action":["One Punch Man","Demon Slayer","Vinland Saga","Baki","Baki Hanma","Full Metal alchemist:brotherhood","Yasuke","Dragon Ball Z","Dragon Ball Super"],
   "Adventure":["My hero academia "," Black Clover","Naruto","Cowboy Bebop"],
   "Supernatural":["Blue exorcist","Jojo's Bizarre Adventure"],
   "Sci-fi":["Attack on Titan","Assasination Classroom","Parasyte"],
   "Fantasy":["Jujustsu Kaisen","Hunter x Hunter","Devilman Crybaby"],
   "Comedy":["Komi Can't Communicate"],
   "Drama":["Food Wars","The Disastrous Life of Saiki K"],
   "Psychological":["Code Geass","Mob Pyscho","Death Note"],
   "Horror":["Castlevania","Record of Ragnarok"],
}

# 随机选一部动漫并输出
random_genre = choice(list(Myanimes))
random_anime = choice(Myanimes[random_genre])
print(f"随机推荐动漫：{random_anime}（分类：{random_genre}）")

内容的提问来源于stack exchange，提问作者Mark Nganga